Temp Gauge goes to hot on highway??? Help please! - Defender Source
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  #1  
Old May 21st, 2009, 03:23 PM
aircraftguy
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2005 LR3
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Temp Gauge goes to hot on highway??? Help please!

Anyone know why the temp gauge is fine around town but on highway it goes up to almost HOT area? I can't figure it out. I pull off highway and drive around town and it goes back down!? Anyone know what the deal is? Thanks
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  #2  
Old May 21st, 2009, 03:31 PM
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Chris Snyder
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Clean out your radiator? Mine was running a bit hot and I decided to give it a try. It dropped the temperature way back down. I couldn't believe how much mud I had accumulated in that thing.
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Old May 21st, 2009, 10:52 PM
aircraftguy
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How did you clean it out?? The weird thing is it gets hotter on highway...when more air is blowing through!? That's what I can't figure out.....

Follow-up Post:

Its a 94 with the 3.9L
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  #4  
Old May 21st, 2009, 11:13 PM
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I don't know how much it would do if you don't wheel it often, but it's worth a shot I guess. I used a hose and a spray nozzle. Just be careful not to spray too hard or you're break the little thin copper fins.

Follow-up Post:

After thinking about it more, the dirty radiator may certainly cause this type of thing. The engine is working hard continuously, but without enough air flow through the radiator. How hot is it actually running? Mine would run just slightly hot around town then slightly worrying on the highway.

I'd run water through the thing both ways for a bit. It certainly can't hurt.
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  #5  
Old May 21st, 2009, 11:24 PM
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Stop driving it until you sort it out. Check for play in the water pump bearing (does the fan jiggle when you shake it), but probably a clogged rad or blown head gasket.
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  #6  
Old May 22nd, 2009, 06:53 AM
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Is the compression test a surefire way to determine the condition of head gaskets?
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  #7  
Old May 22nd, 2009, 09:27 AM
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Don Bunnell
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What is the temp range on the 3.9s? I installed a VDO last fall and with the warmer weather, I can't tell for sure if I'm running hot. Around town it's in the middle of the gauge - 200 deg. On a highway trip the other day it approached 220 deg where the air temp was close to 80 deg.
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Old May 23rd, 2009, 09:31 AM
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Quote:
Originally Posted by aircraftguy
The weird thing is it gets hotter on highway...when more air is blowing through!
Exactly.

Follow-up Post:

Quote:
Originally Posted by rover4x4
Is the compression test a surefire way to determine the condition of head gaskets?
Pulling the heads off and checking he heads and block with a straightedge is the only "surefire" way to determine the head gaskets are bad.
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  #9  
Old May 25th, 2009, 09:16 AM
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Mine did this for a year off and on and it was ultimately traced to a bad head gasket.
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